如何通过滑动手势访问相机？

Question

我在我的 ios 应用程序中添加了滑动手势，但不知何故之后我无法访问相机。我是 swift 的初学者，如果你能建议我如何解决它，我会很高兴。 到目前为止我用过：

  import UIKit

 class ViewController: UIViewController, UIImagePickerControllerDelegate,UINavigationControllerDelegate{

 let imagePicker: UIImagePickerController! = UIImagePickerController()
 let reachability = Reachability()!

override func viewDidLoad() {

    super.viewDidLoad()

    imagePicker.delegate = self

    self.view.backgroundColor = UIColor.flatBlackColorDark()

    let upSwipe = UISwipeGestureRecognizer(target: self, action: Selector(("handleSwipes")))

    upSwipe.direction = .up

    view.addGestureRecognizer(upSwipe)

}

对于函数：

func handleSwipes(sender:UISwipeGestureRecognizer) {

        if (sender.direction == .up){

            if ( UIImagePickerController.isSourceTypeAvailable(.camera)){
                if UIImagePickerController.availableCaptureModes(for: .rear) != nil {
                    imagePicker.allowsEditing = false
                    imagePicker.sourceType = .camera
                    imagePicker.cameraCaptureMode = .photo
                    present(imagePicker,animated: true, completion: {})
                }
            }

Answer 1

你在哪里：

action: Selector(("handleSwipes"))

这样写：

action: #selector(handleSwipes)

原因是"handleSwipes" 不是您的handleSwipes 函数的选择器，您不知道如何正确形成选择器。但是编译器确实知道，并且使用#selector 语法告诉它这样做。